package chapter04.Example17;
class Animal{
    public void shout(){
        System.out.println("喵喵...");
    }
}
//dog类
class Dog extends Animal {
    public void shout(){
        System.out.println("汪汪...");
    }
    public void eat(){
        System.out.println("吃骨头...");
    }
}
public class Example17 {
    public static void main(String[] args) {
        Animal a1 = new Dog();//通过向上转型实例化Animal对象
        System.out.println("Animal a1 = new Dog():"+(a1 instanceof Animal));
        System.out.println("Animal a1 = new Dog():"+(a1 instanceof Dog));
        Animal a2 = new Animal();//实例化Animal对象
        System.out.println("Animal a1 = new Dog():"+(a2 instanceof Animal));
        System.out.println("Animal a1 = new Dog():"+(a2 instanceof Dog));
    }
}
